Picard and Data conclude at one point that Moriarty has set the computers to respond only to his voice. So what's the problem? Data can imitate voices perfectly, as seen in "Brothers", so he can still give the computer orders.

Great Moment :

Picard and Data's solution to the problem is very clever and well executed.

Body Count :

Zero.

Factoid :

The original script for this episode didn't have Moriarty in it at all, but was set around another holodeck character becoming aware of the truth of his existence. It was when Jeri Taylor mentioned having watched "Elementary, Dear Data" to writer Rene Echevarria and he came up with the idea of using his script to do a sequel.

Plotline

The self aware hologram of Professor Moriarty returns, determined to speed up efforts to free him from the holodeck no matter what it takes.